EWS Deletion Chip
We have often been asked for an EWS delete chip. That is, a chip that boost power of their 1995 325i and deletes the EWS protection at the same time.
First of all, what is EWS? EWS is an anti-theft system installed in BMW cars. We are talking about EWS-II, installed in 1995 cars through 1998. Models later than 1998 use the EWS system too, but more advanced versions, like EWS-III, for example. It is similar on its idea to the immobilizer system used in other cars, like Toyota, Honda and VW.
Schematic of the EWS-II system in your 325i E36:
The EWS system in these models is contained in a separate module, which is connected and communicates with the engine computer module or better known as the “DME” (Digital Motronics Engine controller), basically, the ECM. The car key has a chip which sends an unique code through the key lock cylinder through an internal coil antenna. The signal is amplified and sent to the EWS control module. This module will compare the received code with the code stored in the ECM (“DME”) and if codes are the same, all normal functioning is resumed. Otherwise, the starter will not engage and there will be no injection. In short, your car can only be started with your key (transponder key).
Part of the purpose of an EWS DELETE chip is just that, deleting the security system, so the car can start and function with any key as long as it is cut to match the lock. We don’t have an EWS delete chip, but the chip we have can be used along with some simple wiring tampering to delete EWS and to boost performance at the same time.
Since our chip was made for Non-EWS ECM computers, the BOSCH 0 261 200 413 with a red or maroon colored label (1994 and early 1995), it does not has the EWS programming on it and you may use it in the same part number ECM computer that has a silver colored label along with some wiring tampering to eliminate the EWS system.
The wires you will need to tamper are as follows:
1. Cut the EWS wire coming from the EWS module (green) to pin #66 of the DME module
Identifying wire #66:
2. Cut wires #1 and #3 from the EWS module and join the wires that go away from the module, not the ones that come in. Cover with plastic tape.
Location of the EWS module:
The cons of this are of course, that your car will no longer be protected by the EWS system as long as you have this modification. The pros, your car will have more power and you won’t be stranded if the EWS system malfunctions. Another one is, you may have as many copies of your keys as you wish and will not have to spend in programmer serviced to activate each key.
Reaching the EWS Control Module